Search for the $Y(4140)$ via $e^{+} e^{-} \to \gamma \phi J/\psi$ at $\sqrt{s}=$ 4.23, 4.26 and 4.36 GeV

TL;DR

This study searches for the $Y(4140)$ particle in electron-positron collisions at specific energies but finds no significant evidence, setting upper limits on its production rate and decay probability.

Contribution

First search for $Y(4140)$ production via radiative transition in $e^{+} e^{-}$ collisions at these energies, providing constraints on its production cross section and decay branching ratio.

Findings

No significant $Y(4140)$ signal observed.

Upper limits on production cross section times branching ratio established.

Results constrain models of $Y(4140)$ production in $e^{+} e^{-}$ collisions.

Abstract

Using data samples collected at center-of-mass energies $\sqrt{s} = 4.23$, 4.26, and 4.36 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the production of the charmoniumlike state $Y(4140)$ through a radiative transition followed by its decay to $\phi J/\psi$. No significant signal is observed and upper limits on $\sigma[e^{+} e^{-} \rightarrow \gamma Y(4140)] \cdot \mathcal{B}(Y(4140)\rightarrow \phi J/\psi)$ at the $90\%$ confidence level are estimated as 0.35, 0.28, and 0.33 pb at $\sqrt{s} = 4.23$, 4.26, and 4.36 GeV, respectively.